Simulation analysis of flooding in lower Qinhe River—A case study of July 2021 flood
In July 2021,the lower Qinhe River was affected by the severe typhoon In-Fa,which caused heavy rainfall and the largest flood occurred since 1982,the Hekou village reservoir played a huge role in the flood regulation process.In order to simulate and analyze the flood process of the lower Qinhe River in July 2021 without the Hekou village reservoir,a two-dimensional hydrodynamic model was established using the MIKE21.The results showed that the peak-cutting effect of the Hekou village reservoir was significant.Compare with no Hekou village reservoir,the number of peak flood events at Wuzhi hydrological station decreased from 3 times to 2 times and the magnitude of flood peaks also decreased significantly,and the peak flow rates also decreased from 1 727 m3/s,1 773 m3/s,and 1615 m3/s to 368 m3/s and 1 510 m3/s.The duration of high flow during the flood process was also influenced by the reservoir′s peak-cutting effect,the duration of flow above 1 200 m3/s decreased from 49 h to 24 h,and the duration of flow above 1 500 m3/s even decreased from 25 h to 0.The Hekou village reservoir has also improved the situation of flood-sustained areas in the lower Qinhe River.The inundation areas in the natural overflow area of the north qinyang and the lower Qinhe River have been decreased by 1 575.33 hectares and 473.73 hectares respectively.The research results can provide technical support for flood prevention work in the lower Qinhe River.
lower Qinhe RiverMIKE21 modelflood simulationflood control and disaster reduction
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